330 CHECK-LIST OF NORTH AMERICAN BIRDS. 
a. [Cinclus mexicanus mexicanus. Extralimital.] 
b. Cinclus mexicanus unicolor Bonaparte. Dipper. [701.] 
Cinclus unicolor BONAPARTE, Zool. Journ., III, 1827, 52, 53. (‘‘ Atha- 
pescow Lake,” probably near the source of the Athabaska River.) 
Rance.— Hudsonian, Canadian, and Transition zones in mountains of 
western North America from near tree limit in northwestern Alaska, north- 
eastern British Columbia, and west central Alberta south to northern Lower 
California and southern New Mexico; accidental in the Black Hills, South 
Dakota, and in western Nebraska. 
Famity MIMIDA. THrasHERS, MocKINGBIRDS, ETC. 
GENus OREOSCOPTES Bairp. 
Oreoscoptes Bairp, Rep. Expl. & Surv. R. R. Pac., IX, 1858, xix, xxxv, 
346. Type, by monotypy, Orpheus montanus TOWNSEND. 
Oreoscéptes montanus (J. K. TowNsEND). Sage Thrasher. [702.] 
Orpheus montanus TOWNSEND, Journ. Acad. Nat. Sci. Phila., VII, 1837, 
192. (Sandy Creek, Lat. 42° N., Long. 109° 30’ W., Wyoming.) 
Rancr.— Arid sagebrush plains and foothills of western United 
States. Breeds in Transition and Upper Sonoran zones from south- 
ern British Columbia, central Montana, and western Nebraska south 
to east central California and northern New Mexico; winters from 
southern California and mountains of central Texas to northern Mexico 
(Chihuahua and Tamaulipas), and Cape San Lucas, and casually to 
Guadalupe Island. 
GENUS MIMUS Bole. 
Mimus Bors, Isis, XTX, 1826, 972. Type, by monotypy, Turdus poly- 
glottos LINN&ZUS. 
Mimus polyglottos (LINNus). 
RanGE.— United States south to the West Indies and Mexico. 
